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Some Theoretical Considerations of Dynamic‐Property Data on Textile Specimens

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1 Author(s)
Lyons, W.James ; Chemical and Physical Research Laboratories, Akron, OhioThe Firestone Tire and Rubber Company, Akron, Ohio

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1. Early stretch-vibrometer data, of quite extensive character, on the frequency dependence of the internal friction μ of a Nylon monofil, has been found to conform to the relation μ=[μ2/(1+ω2τ22)]+μ3 which was deduced independently by Tobolsky and Eyring from considerations of molecular structure. Among other constants evaluated was the relaxation time for the secondary-bond network τ2, which was found to have the value 9.3 sec. 2. By more sensitive graphing methods than had been used heretofore, it was confirmed by the Nylon data that the hyperbolic relationship between resonant frequency ω0 and internal friction μ holds equally as well as the foregoing equation. The two relationships are shown to be nearly equivalent in the present experimental range. On evaluation of graphical parameters, the equation μω0=2.47×109 ergs/cm3 was obtained. 3. Using the same graphical method with a set of data on 11/4/2 cotton cord the relation (μ+0.9)ω0=7.05 ×109 ergs/cm3 was established.

Published in:

Journal of Applied Physics  (Volume:21 ,  Issue: 6 )

Date of Publication:

Jun 1950

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